I assume you mean X5, as seen in the EPR Report.
The Spur Gear is so that we can use the B4 slipper pads as we find these much more consistent through a 5 minute run compared to slipper pucks.
The idler gear mod is only run by me and Dan. It requires a speedo where you can reverse the motor rotation, such as the Novak Slydr. It's done so that the motor rotates in the same direction as the wheels. This gives a bit more weight transfer to the rear under acceleration, as well as making the car jump a little better in my experience.
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Yokomo - LMR
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